WO2010024712A1 - Accumulateur hydropneumatique pourvu d'une charge poreuse flexible - Google Patents

Accumulateur hydropneumatique pourvu d'une charge poreuse flexible Download PDF

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Publication number
WO2010024712A1
WO2010024712A1 PCT/RU2008/000741 RU2008000741W WO2010024712A1 WO 2010024712 A1 WO2010024712 A1 WO 2010024712A1 RU 2008000741 W RU2008000741 W RU 2008000741W WO 2010024712 A1 WO2010024712 A1 WO 2010024712A1
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WIPO (PCT)
Prior art keywords
filler
gas
separator
accumulator
accumulator according
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Ceased
Application number
PCT/RU2008/000741
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English (en)
Inventor
Alexander Anatolyevich Stroganov
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN2008801316485A priority Critical patent/CN102197229A/zh
Priority to CA2735852A priority patent/CA2735852A1/fr
Priority to EP08876268A priority patent/EP2324252A1/fr
Priority to DE212008000107U priority patent/DE212008000107U1/de
Priority to EA201100385A priority patent/EA201100385A1/ru
Publication of WO2010024712A1 publication Critical patent/WO2010024712A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/42—Heat recuperators for isothermal compression and expansion

Definitions

  • the invention refers to mechanical engineering and can be used for fluid power recuperation in hydraulic systems with high level of fluid flow and pressure pulsations, including systems with a common pressure rail, in hydraulic hybrid cars, in particular those using free-piston engines, as well as in systems with high rate of flow rise and hydraulic shocks, for example, in molding and press-forging equipment.
  • a hydropneumatic accumulator (hereinafter - the accumulator) includes a shell containing a gas reservoir of variable volume filled with pressurized gas through a gas port as well as a fluid reservoir of variable volume filled with fluid through a fluid port. These gas and fluid reservoirs are separated by a separator, which is movable relative to the shell.
  • the accumulator is generally charged with nitrogen up to the initial pressure of several to dozens MPa.
  • An accumulator generally contains one gas reservoir and one fluid reservoir of variable volume, with equal gas and fluid pressure in them.
  • the accumulator [4] contains one gas reservoir and several fluid reservoirs of variable volume. Their commutation changes the ratio between the gas pressure in the gas reservoir and the fluid pressure in the hydraulic system.
  • the accumulator For fluid power recuperation the accumulator is preliminarily charged with the working gas through the gas port and is connected through the fluid port to the hydraulic system.
  • the fluid When power is transferred from the hydraulic system to the accumulator, the fluid is pumped from the hydraulic system to the accumulator moving the separator and compressing the working gas in the gas reservoir, while the pressure and temperature of the working gas increase.
  • the power returns to the hydraulic system from the accumulator the compressed gas expands moving the separator with decreased volume of the fluid reservoir and forcing fluid out of it into the hydraulic system.
  • the gas pressure and temperature decrease. Since the distance between the gas reservoir walls is quite big (dozens and hundreds millimeters) the heat exchange between the gas and the walls due to the gas heat conductivity is insignificant.
  • the accumulator includes a shell in which fluid and gas ports are respectively connected with fluid and gas reservoirs of variable volume separated by a separator movable relative to the shell.
  • the gas reservoir of variable volume contains a flexible porous filler in the form of open-pore elastomer foam filling the gas reservoir so that when fluid is pumped into the accumulator the separator movement reducing the gas reservoir volume compresses the filler, and when the fluid is displaced out of the accumulator the filler expands due to its intrinsic springiness. When compressed the filler takes away some heat from the gas and reduces its heating, and when expanded the filler returns the heat to the gas and reduces its cooling.
  • the small (about 1 mm) size of the filler pores decrease the temperature gradients during the heat exchange between the gas and the filler hundreds of times and increase the heat exchange reversibility during gas compression and expansion considerably.
  • the porous structure of the filler prevents convective heat exchange of the gas with the gas reservoir walls, thus decreasing the heat transfer to the gas reservoir walls and the respective power losses many times. Therefore, practically all the heat given by the gas to the filler during compression is returned to the gas during expansion while the recuperation efficiency increases considerably [5], [6].
  • the filler loses its ability to reshape and to fill the entire volume of the gas reservoir while the recuperation efficiency decreases.
  • the accumulated residual deformation reaches one quarter of the initial volume of the filler and growing losses of the fluid power in the piston accumulator already within 36000 cycles (400 hours) of slow (0,025 Hz) compression and expansion can be observed.
  • Foam degradation strengthens considerably in real hydraulic systems where due to the high-frequency pulsations the separator moves non-uniformly, with frequent jerks especially strong in hydraulic hybrid cars [9] using strongly intermittent free-piston engines [10] and phase-controlled hydraulic transformers [11] and in hydraulic systems with a common pressure rail.
  • the object of the invention is prevention of development of residual deformations of the flexible porous filler during multiple cycles of recuperation of fluid power and elimination of the influence of the filler material degradation on recuperation efficiency, prevention of the filler destruction in case of non-uniform movement of the separator with strong jerks, prevention of the filler material destruction and losses and the accumulator gas port damage during working gas charging and discharging as well as longer operating life under increased temperature of the environment and, thus, creation of a long lasting and reliable hydropneumatic accumulator for highly efficient recuperation of fluid power.
  • a hydropneumatic accumulator (hereinafter - the accumulator) that includes a shell containing a fluid reservoir of variable volume connected with a fluid port and a gas reservoir of variable volume connected with a gas port. These gas and fluid reservoirs are separated by a separator movable relative to the shell.
  • the gas reservoir contains a flexible porous filler (hereinafter - the filler) that fills the gas reservoir so that the separator movement reducing the gas reservoir volume compresses the filler.
  • the task of preventing development of residual deformations of the filler and elimination of the influence of the filler material degradation on the power recuperation efficiency is solved by that the filler is connected with internal walls of the gas reservoir with the possibility of the filler stretching when the separator is moved increasing the gas reservoir volume.
  • the filler is forced to reshape by using springiness of the compressed gas moving the separator during its expansion, the separator pulling the filler attached to it and stretching it.
  • the accumulator contains means of protection of the filler boundary layer against rupture (hereinafter - means of protection) made with the possibility of reducing local deformations of the filler boundary layer in case of jerks of the separator.
  • the prespecified limit of reversible deformations depends on the choice of the porous material of the filler and on the prior deformation of this material corresponding to the maximum volume of the gas reservoir.
  • the filler is preferably made from foamed elastomer with open pores, for example, foamed polyurethane or foamed latex.
  • the filler is made in such a way that at the maximum volume of the gas reservoir the porous material of the filler should be compressed along the direction of the separator movement to the prespecified degree of precompression below 5.
  • the limit of reversible extension deformations is specified as relative elongation at which the initial size of the pores of the undeformed porous material is restored.
  • the separator jerk force characterizes the dynamics of the accelerated motion of the separator and determines the load on the filler boundary layer adjacent to the separator when the filler is entrained by the separator into accelerated motion. The higher the separator acceleration and the amplitude of its movement with the acceleration, the higher the jerk force.
  • the maximum jerk force of the separator can be limited by the operation conditions, for example, by the frequency and amplitude of the pulsations in the hydraulic system.
  • the maximum force of the separator jerks corresponds to the maximum possible rate of the fluid flow rising from the accumulator at the moment of instantaneous drop of pressure in the hydraulic system from the maximum value to the atmospheric pressure.
  • the invention provides for pneumatic or elastic embodiments of the means of protection as well as their combination.
  • the means of protection include at least one gas-dynamic barrier made near the separator transversally to the direction of the separator jerks at a selected distance exceeding the average size of the pores of the filler boundary layer, with the chosen gas permeability along the separator movement smaller than the average gas permeability of the porous material of the filler.
  • the gas dynamic barrier prevents pressure balance between the layers separated by it; the lower the gas permeability of the barrier and the greater the difference between the speed of expansion or compression of these layers, the stronger is the action of said barrier.
  • the separator jerks become more intensive, the growing pressure drop at the gas dynamic barrier provides higher acceleration of the barrier and the adjacent filler layers, thus reducing the load on the filler boundary layer adjacent to the separator and decreasing its local deformations.
  • the means of protection include at least one elastic element connecting the separator with internal layers of the filler that are away from the separator by the chosen depth exceeding the average size of the pores of the filler boundary layer.
  • piston accumulators such elastic elements are fixed both on the separator and the shell.
  • Proposed is also distributed embodiment of elastic elements in the form of reinforced webs between the pores in the boundary layer of the filler wherein the springiness of the reinforced webs is as higher as they are closer to the separator.
  • the webs are reinforced, for example, by reducing the porosity and increasing the density of the porous material in the boundary layer or by introducing more elastic polymeric materials in the pores of the boundary layer.
  • the tasks of preventing losses of the filler material at working gas discharging as well as increasing the reliability of operation of the gas port of the accumulator are solved by separating the gas port from the filler by a filter made with the possibility to transmit gas into the gas port and not to transmit the filler material into the gas port from the gas reservoir of the accumulator, for example, in the form of a membrane, the average size of its pores not exceeding the average thickness of the webs between the filler pores and the average distance between the membrane pores being less than the average cross dimension of the canals between the filler pores.
  • the gas port contains a flow restrictor made with the possibility of restricting the gas flow through the gas port so that the pressure drop in case of an open gas port exceeds, preferably 10 and more times, the maximum pressure difference between different areas of the filler.
  • a flow restrictor in the form of a throttle separated by a filter from the filler and integral embodiment where the filter is made with the above- described possibility of restricting the gas flow, for example, in the form of a three- dimensional solid porous structure with increased gas-dynamic resistance.
  • the filler near the gas port is made with increased gas permeability exceeding the average permeability of the porous material of the filler, which compensates the increased density of the gas flow near the gas port during gas charging and discharging and decreases the pressure drops in the filler.
  • Proposed are both filler embodiments with separate drainage canals in the filler and distributed embodiments with the filler near the gas port made from porous material with increased sections of canals between the pores.
  • the filler contains a material with the phase transition in the temperature range between the maximum temperature of the environment and the maximum permissible temperature of using the filler.
  • the filler is impregnated with hydrocarbons with the melting temperature in the range between 80 and 120C.
  • Fig.2 Accumulator with an elastic separator in the form of a bladder and combined pneumatic and elastic means of protection; axial section.
  • Fig.3 Accumulator with an elastic separator in the form of a membrane and elastic means of protection; axial section and section in the plane perpendicular to the rotation axis.
  • the hydropneumatic accumulator of Fig. 1-4 include the shell 1 with the fluid reservoir 2 of variable volume connected with the fluid port 3 and the gas reservoir 4 of variable volume connected with the gas port 5. These gas and fluid reservoirs of variable volume are separated by the separator 6.
  • the gas reservoir 4 contains the filler 7 that fills the gas reservoir 4 so that movement of the separator 6 reducing the volume of the gas reservoir 4 compresses the filler 7.
  • the filler 7 is connected with internal walls of the gas reservoir 4, namely with the shell 1 and the separator 6 with the possibility of stretching the filler 7 during movement of the separator 6 increasing the volume of the gas reservoir 4.
  • the filler is glued to the buffer insert 8 installed on the separator 6.
  • the filler is glued directly to the elastic separator 6 and the elastic elements 9 connected with it.
  • the filler 7 is glued to the shell insert 10 installed on the shell 1.
  • the accumulator (Fig. 1 - 4) precharged with gas through the gas port 5 is connected with the hydraulic system via the fluid port 3.
  • the fluid is pumped through the fluid port 3 of the accumulator into its fluid reservoir 2, the separator 6 is moved reducing the volume of the gas reservoir 4 and increasing gas pressure and temperature in it.
  • Gas gives away part of the heat to the filler 7, that reduces the gas heat at compression; due to the small pore size the gas heat exchange with the webs is reversible with small temperature differences between the webs of the pores and the gas in them.
  • the heat losses are small as the reduced gas heating reduces the heat transfer to the walls of the shell due to heat conductivity; and due to the porous structure no convective heat transfer arises in the filler to the walls of the shell.
  • the compressed gas expands and the separator 6 is moved reducing the volume of the fluid reservoir 2 and forcing fluid out of it through the fluid port 3 into the hydraulic system.
  • the separator 6 entrains the filler 7 attached to it ensuring reshaping of the filler and complete filling of the expanding gas reservoir with the porous material of the filler.
  • the filler Since the distances between gas and the pore webs of the filler 7 are kept small the filler effectively returns the received part of the heat to the gas.
  • the accumulator returns the fluid power received from the hydraulic system back into it practically without any losses while reshaping of the filler 7 in each cycle of recuperation, irrespective of the elastic properties of the material and its degradation, is forced through use of the springiness of the compressed gas moving the separator 6 during its expansion, with the separator 6 pulling the filler 7 attached to it and extending it preventing development of residual deformations.
  • the accumulator contains means of protection made with the possibility of reducing local deformations of the filler boundary layer at jerks of the separator.
  • the invention provides for pneumatic or elastic embodiments of the means of protection as well as their combinations.
  • the accumulator of Fig. 1 has pneumatic means of protection
  • the accumulators of Fig. 3 have elastic means of protection while the accumulators of Fig. 2 and Fig. 4 have combined pneumatic and elastic means of protection.
  • the means of protection in the piston accumulator of Fig. 1 include gas- dynamic barriers in the form of membranes 11 with holes 12 located transversally to the direction of motion of the separator 6.
  • the bladder accumulator of Fig. 2 contains combined pneumatic and elastic means of protection.
  • said means of protection are elastic elements 9, their thickness decreasing with depth of penetration into the filler material.
  • the elastic elements 9 are formed on the separator 6 from the same elastic polymeric material as the separator 6 itself.
  • the elastic element can be made in the form of the webs between pores with increased springiness near the separator exceeding the average springiness of the webs between the filler pores. In this case the springiness of the webs in the boundary layer is increased by porosity reduction and density increase of the material of the porous filler or by impregnation it with elastic glue.
  • the filler 7 is also provided with pneumatic means of protection in the form of gas-dynamic barriers made as a set of membranes 11 with holes 12 located transversally to the direction of the separator 6 motion.
  • Fig. 1 and Fig. 2 The permeability of the membranes 11 in Fig. 1 and Fig. 2 and the distance between them increase as they are more remote from the separator 6.
  • Fig. 1 the adjacent layers of the porous material of the filler 7 are glued to the membranes 11 made of a polymeric film.
  • Fig. 2 the layers of the porous material of the filler 7 are glued together by an elastic glue forming the elastic membranes 1 between them.
  • the gas-dynamic barriers can be made distributed, namely as a set of canals of reduced permeability connecting the pores of the filler 7.
  • the filler 7 it is preferable to make the filler 7 with non-uniform permeability of its canals throughout its volume, namely reduced near the separator 6 and increased near the gas port 5.
  • the means of protection contain elastic elements 9 in the form of concentric bellows made of an elastic polymeric material so that as the distance from the separator increases, the thickness of the walls of the tubes decreases while the corrugation curvature increases, which ensures smooth decrease of springiness.
  • the filler 7 is glued to the separator 6, to the elastic elements 9 and to the shell insert 10 installed on the shell 1 with the collector gap clearance 13 between them.
  • the means of protection include a set of elastic membranes 14 with holes 15 located transversally to the direction of the separator 6 motion and united into a multilayer plate spring 16 attached on the one side to the separator 6 and attached on the other side to the shell 1 via the shell insert 10.
  • the adjacent layers of the porous material of the filler 7 are glued to the elastic membranes 14.
  • the elastic membranes 14 are preferably made from metal and are at the same time both gas-dynamic barriers and elastic elements. Their gas permeability is increased near the gas port 5 due to the diameter of the holes 15 and their quantity increase.
  • the separator 6 When the accumulator operates as a part of hydraulic system with high frequency pulsation or high flow growth rates and hydraulic impacts the separator 6 moves non-uniformly, with strong jerks causing local deformations of extension or compression of the filler 7 in the boundary layer adjacent to the separator 6.
  • the separator 6 shoots with a large acceleration towards the fluid port (up in Fig. 1 and Fig. 4, up and sideways in Fig. 2 and Fig.3) entraining the filler 7 attached to it.
  • the pneumatic means of protection of Fig. 1 , Fig. 2, Fig. 4 work as follows. Due to the high gas-dynamic resistance of the membranes 11 or 14 on each of them there appears underpressure on the side facing the separator 6 and overpressure on the opposite side. The arising pressure drop push each membrane 11 or 14 towards the separator 6 and the membranes entrain the adjacent layers of the filler 7 reducing the load on the boundary layer of the filler and its local stretching deformations distributing the extension into the depth of the filler.
  • the increase of the permeability and distance between the membranes as their distance from the separator increases ensure smooth decrease of the acceleration of the membranes and the connected layers of the porous material of the filler, which ensures uniform distribution of deformations and prevents redundant deformations both in the boundary layer and in the volume of the filler.
  • the separator jerks in the opposite direction the pressure drops push the membranes 11 or 14 away from the separator 6, which decreases local compression deformations in the boundary layer.
  • Elastic means of protection of Fig. 2-4 work as follows.
  • the elastic elements of the accumulator entrain the adjacent layers of the porous material of the filler in accelerated motion distributing the acceleration and respective inertia loads and deformations deeper into the filler thus reducing local deformations of its boundary layer.
  • the decrease of springiness of the elastic elements 9 with increase of the distance from the separator as shown in Fig. 2, Fig. 3, or connection of the elastic element with the shell in the form of a multilayer plate spring 16 as shown in Fig. 4 ensure smooth decrease of the accelerations of the connected layers of the porous material of the filler, which ensures uniform distribution of deformations and prevents redundant deformations both in the boundary layer and in the volume of the filler.
  • the means of protection with the possibility of reducing local deformations of the filler extension down to the values not exceeding the prespecified limits of reversible deformations at maximum jerks of the separator.
  • the maximum jerk force of the separator 6 can be restricted by the operation conditions. For example, if the accumulator is to be used in a hydraulic hybrid car with a free piston engine, the working volume and maximum frequency of the engine displacement strokes determine the maximum acceleration and amplitude of the separator movements and the maximum force of its jerks. When the accumulator works with several pulsating sources and loads, for example, in a common pressure rail, the maximum jerk force is determined as the total of all sources and loads.
  • the maximum rise rate of the fluid flow from the accumulator is determined, first of all, by the hydrodynamic characateristics of its fluid port 3.
  • the fluid port 3 contains a poppet valve 17 restricting the fluid flow and its rise rate, which decreases the maximum jerk force of the separator.
  • the fluid port 3 with the poppet valve 17 is made with such level of the fluid flow restriction that allows to implement nothing more than elastic means of protection.
  • the prespecified limit of reversible transformations depends on the choice of the porous material of the filler and on preliminary deformation of this material corresponding to the maximum volume of the gas reservoir.
  • the preferred filler is made from foamed open-pore elastomer, for example, foamed polyurethane or foamed latex, with pores from tenths of a millimeter to few millimeters. From the point of view of durability the filler is preferably made so that at the maximum volume of the gas reservoir the porous material of the filler is compressed along the direction of the separator movement at the prespecified degree of precompression below 5, while the limit of reversible deformations is specified as relative elongation at which the initial size of the pores of the undeformed porous material is restored.
  • foamed open-pore elastomer for example, foamed polyurethane or foamed latex
  • the gas charging pressure is 9 MPa
  • the pores can be extended twice (from 0.5 to 1 mm) and at the pressure of 25 MPa - up to 5 times (from 0.2 to 1 mm).
  • the extension of the compressed pores up to the size not exceeding the initial size saves the pore webs from irreversible cyclic extension, thinning and rupture.
  • the quantity, shapes and layout of the gas-dynamic barriers or elastic elements is chosen as well as their permeability or springiness, respectively. Stronger jerks of the separator and lower limits of reversible deformations require more gas-dynamic barriers or elastic elements with less thickness of the layers between them; provided that the gas-dynamic barriers have lower permeability while elastic elements have higher springiness near the separator and greater depth of penetration of the elastic elements into the filler.
  • the filter 18 is installed between the shell insert 10 and the gas port 5.
  • the filter is made from a porous material with the possibility to transmit gas and to trap the filler material and to limit the gas flow at its charging and discharging so that its pressure drop with the open gas port 10 and more times exceeds the maximum pressure difference between different areas of the filler.
  • a separate restrictor of the gas flow in the form of a throttle separated from the filler by a filter made with the possibility to transmit gas and not to transmit the filler material into the gas port from the gas reservoir of the accumulator, for example, in the form of a membrane, the average size of its pores not exceeding the average thickness of the webs between the filler pores and the average distance between the membrane pores being less than the average cross dimension of the canals between the filler pores.
  • the filler 7 near the gas port 5 made from a porous material with increased sections of canals between the pores.
  • the preferred filler has higher springiness near the gas port 5, namely it is made from a denser porous material but with increased pore size and sections of canals between them.
  • the accumulator may have an additional gas port of emergency release.
  • the additional gas port is provided with the same means of preventing filler material damage and losses as the main gas port.
  • the means of protection also provide for prevention of twisting of the filler 7 both during assembly of the accumulator and at turns of the separator 6 that are possible during its movement. Twisting is prevented, for example, by the possibility of rotation of the buffer insert 8 or shell 10 insert relative to the separator 6 or the shell 1 , respectively.
  • Piston accumulators can have a piston with a chamber and a membrane in it dividing the chamber into a fluid part and a gas part communicating with the fluid reservoir and gas reservoir, respectively, through windows in the piston.
  • the filler has higher springiness and permeability near the piston windows, that ensures preservation of the filler material and good gas exchange between the chamber and the gas reservoir at fluctuations of the membrane.
  • any of the accumulators mentioned is preferably made with the filler containing a material with the phase transition in the temperature range between the maximum temperature of the environment and the maximum permissible temperature of using the filler.
  • the filler is impregnated with hydrocarbons with the melting temperature range between 80 and 120C.
  • the temperature of the gas and the filler during compression grows until it reaches the temperature of the phase transition. After that the melting hydrocarbons absorb a large amount of heat reducing the heat degree and preventing temperatures dangerous for the filler material.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Pipe Accessories (AREA)

Abstract

La présente invention concerne un accumulateur hydropneumatique pourvu d'une charge poreuse flexible destiné à la récupération de l'énergie hydraulique dans les systèmes hydrauliques présentant un niveau de pulsations élevé. Ledit accumulateur hydropneumatique comprend une coque dans laquelle un port gazeux et un port hydraulique sont raccordés respectivement à un réservoir de gaz et à un réservoir hydraulique de volume variable séparés par un séparateur mobile. La charge poreuse flexible remplit le réservoir de gaz de sorte que le mouvement du séparateur qui réduit le volume du réservoir de gaz comprime ladite charge. La charge est raccordée aux parois internes du réservoir de gaz avec la possibilité d'étirer la charge au moment du mouvement du séparateur augmentant ainsi le volume du réservoir de gaz. L'accumulateur comprend des moyens de protection de la couche limite de la charge contre la rupture avec la possibilité de réduire les déformations locales de la couche limite de la charge en cas de secousses du séparateur. Le développement de déformations de la charge lors des multiples cycles de récupération et la destruction lors d'un mouvement non uniforme du séparateur avec de fortes secousses sont évités.
PCT/RU2008/000741 2008-09-01 2008-11-27 Accumulateur hydropneumatique pourvu d'une charge poreuse flexible Ceased WO2010024712A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN2008801316485A CN102197229A (zh) 2008-09-01 2008-11-27 具有柔性多孔填充物的液压气动蓄能器
CA2735852A CA2735852A1 (fr) 2008-09-01 2008-11-27 Accumulateur hydropneumatique pourvu d'une charge poreuse flexible
EP08876268A EP2324252A1 (fr) 2008-09-01 2008-11-27 Accumulateur hydropneumatique pourvu d'une charge poreuse flexible
DE212008000107U DE212008000107U1 (de) 2008-09-01 2008-11-27 Hydropneumatischer Akkumulator mit flexiblem porösem Füllstoff
EA201100385A EA201100385A1 (ru) 2008-09-01 2008-11-27 Гидропневматический аккумулятор с гибким пористым наполнителем

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RU2008135885/06A RU2382913C1 (ru) 2008-09-01 2008-09-01 Гидропневматический аккумулятор с гибким пористым наполнителем

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FR2979960A1 (fr) * 2011-09-13 2013-03-15 Bosch Gmbh Robert Installation d'amortissement de module hydraulique et pompe a piston de systeme de freins de vehicule ainsi equipee

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RU2382913C1 (ru) 2010-02-27
EA201100385A1 (ru) 2011-08-30
US7918246B2 (en) 2011-04-05
CA2735852A1 (fr) 2010-03-04
UA95592C2 (ru) 2011-08-10
US20100050622A1 (en) 2010-03-04
CN102197229A (zh) 2011-09-21
DE212008000107U1 (de) 2010-12-02
EP2324252A1 (fr) 2011-05-25
TW201020444A (en) 2010-06-01

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